Experimental Observation of Magnetic Fluctuations in NBI Heated Plasmas in CHS
Experimental Observation of Magnetic Fluctuations in NBI Heated Plasmas in CHS
复制标题
CHS 中 NBI 加热等离子体磁涨落的实验观察
DOI：
10.1143/jpsj.63.4406
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发表时间：
1994
影响因子：
1.7
通讯作者：
Kiyomasa Y. Watanabe
中科院分区：
文献类型：
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作者：
S. Sakakibara;H. Yamada;A. Ejiri;K. Ida;K. Matsuoka;T. Morisaki;S. Morita;O. Motojima;K. Nishimura;S. Okamura;C. Takahashi;K. Toi;Kiyomasa Y. Watanabe
在紧凑螺旋系统（CHS）中研究了NBI加热等离子体中频率f≤100khz的磁波动。将观测到的相干涨落识别为m≤4，n≤3的全局模态。电阻和理想交换模式的理论模型很好地解释了这些模式对磁组态和等离子体β的依赖。这些模态和非相干波动都随着beta值的增加而增加，但在达到1%左右时达到饱和。目前的可达极限=2.0%是由一个关键机制不是这里所研究的不稳定性的约束所决定的。非线性饱和机制必须澄清，因为波动幅度的变化不能从饱和水平与不稳定性线性增长率成正比的模型中解释。
The magnetic fluctuations with the frequency f ≤100 kHz in NBI heated plasmas have been investigated in the Compact Helical System (CHS). The observed coherent fluctuations are identified as global modes with m ≤4, n ≤3. The dependences of these modes on the magnetic configuration and the plasma beta are well interpreted phenomenologically by the theoretical models of the resistive and the ideal interchange modes. Both these modes and the incoherent fluctuations increase with the beta value , however, saturate when reaches about 1%. The present accessible limit of =2.0% is determined by the confinement of which a key mechnism is not the instabilities investigated here. The nonlinear saturation mechanism must be clarified, because the change of the fluctuation amplitude can not be explained from the model that the saturation level is proportional to the linear growth rate of an instability.